let asd ={
    'jia':function(a,b){
        
        return a+b;
    },
    'jian':function(a,b){
       
        return a-b;
    },
    'cheng':function(a,b){
       
        return a*b;
    },
    'chu':function(a,b){
       
       return a/b
    }
}
module.exports=asd;